This is actually the mode of application I use, probably cos its the easiest.
I cut the lemon in half, and keep it refrigerated. I apply it most nights after washing my face with cold water and toilet soap. Been doing it for about a month now and I can proudly say that my face feels like a baby's skin! The rashes cleared in one week, and I'm hoping the dark spots would completely disappear.

The negative side to the use of lemon is that it lightens the skin, slowly but effectively.
Constant use over a period of time would give the face a lighter complexion. You would look funny if the face is much more lighter than your body.
My face used to be darker than the rest of my body, thanks to Nigerian Sun! But now its almost the same shade with the rest of my body.
So it would be advisable to take a break from the use of lemon on the face once you've achieved the clear skin you needed. Unless you you find a way of applying it on your entire body (If you do, please share!).

Now to my 2nd favorite and most recently discovered use of lemon.
To lighten dark lips.
I had never given much thought to what my lips looked like naked from lipsticks until recently. I just noticed that they were too dark for my complexion.
Dark lips are commonly caused by smoking, excess tea or coffee intake, sun exposure and improper maintenance.
I don't ever smoke, I wouldn't take hot tea to save my life, My mum banned coffee in my house so I would attribute my dark lips to sun exposure and improper maintenance.

There are also different ways to lighten dark lips which include use of honey as lip balm, increased intake of water and vegetables, moisturizing the lips, use of lemon juice to remove tan from lips etc.
I plan to implement most of these tips. I also made a 'solution' for use on my lips.
I squeezed lemon juice into a small container and mixed it with honey. I used a cotton bud to apply it on my lip as a lip balm.
The mixture can be preserved in the fridge for up to a week.
The lemon juice peels off the dark skin and the honey adds pink color to the lips. Leave on the lips for an hour before wiping off with soft cloth. This can be applied as many times as possible in a day.
I just started this yesterday, even got my siblings to join me in the experiment, lol.
Would keep you posted on the progress.
I might even do a 'before and after' post... 'looking for my camera to take a pic of the before'
Till then!

Nice tips abt d lemon.am also usin lemon for my acne.it's rly effective.using it in d night is advisable,When lemon juice comes into contact with your skin and your skin is exposed to the sun it can lead to a dark streaky rash on your skin and sunburn that may last for MONTHS!!so alwys use a sunscreen wth spf30 n apply lemon juice on skin twice/thrice in a week. Love ur blog dear.more grease to ur elbow

Lemon is good for the face,I used it sometime for my face then for my body I use lemon,yogurt,avocado pear and oats, pretty stressful,I've not done in a while now tho..Thank God my lips are not black.lol

Tried the 'lemon in cotton wool method' before and it stung so bad,maybe cos of the pimples.lazy as I am,I stopped the treatment,now I think I'l face it and just try again.plus I hate the smell of honey,I wonder how I'l work on my dark lips